Stair construction



Sept. 11 1923.

W. J KORBER STAIR CONSTRUCTION Filed Sept. 17'. 1921 ATTORNEY Patented Sept. 11, 1923.

. UNITED STATES WILLIAM J. KORBER, or CHTCAGO,ILLINOTS.

STAIR CONSTRUCTION.

Application filed September 17, 1921. Serial.N0. 501,270.

Be it known that l. \VHLIAM J. Konmcn. a citizen of the United tates. residing at Chicago. in the county of (fool: and State of Illinois. have invented new and useful linbrovenicnts in Stair (Tonsilrurtions. of which the ti'illowing is a specification.

This invention relates to the construction of stairu'ays in buildings and an ob ject of the invention is to provide a stair c-onstructimi which is durable. neat. in ap pearance. and can he built at a relatively low cost.

Another object of this invention is to provide a stairway construction specified in which the reinforcing beams and concrete beneath the stair treads are hidden from view from below by arcuate reinforcing sheets of metal which provide a neat ap pearing smooth surface at the under side of the stairway.

()ther objects of the invention Will appear in the following detailed description and in the accompanying drawing wherein:

Fig. l is a fragmentary section through a stair constructed in accordance with this invention.

Fig. 2 is a fragmentary section through a modified form of the stair.

Fig. 3 is a fragmentary section through a further modified form of the stairs.

Referring more particularly to the drawing the improved stair comprises metal reinforcing mcmbers l which are constructed of sheet metal and have their upper ends angled as shown at 2. the said strips being attached to bracing members I) which are anchored to the side supports 4 of the stairs. The tread 5 and riser G which are preferably marble slabs. are supported in spaced relation to the plates '1 and their angled edges 2 and from the concrete tiller 7 by a mortar layer ii. The concrete filler 7 is in turn held in position by bowed plates 8 which extend l'ransvii-rscly across the stair and have their oncave surfa e positioned outwardly. The upper edge 9 of the plates 8 are inserted beneath the lower angled edges ll! of the plate 8 of lhe step next thereabovc. and riveted thereto. thereby interlocking the plates The plates 8 provide a smooth neat appearing surface from beneath the stairs which hides all the metal braces and the concrete T and provides a neat appearing strong stair structure.

In Fig. .3 of the drawing the modified form of stair comprises a tread 20 of marble which is supported upon a concrete filler 21 held in place by an arcuate plate 22 simi lar in construction to the plate 8. The riser 3 of the modified form of step is, however. formed of metal and is not faced with a marble slab as in the preferred form previously described. The riser 23 is provided with an outstruck ridge 24 extending trans versely thereacross, which forms what is known in the art as a center cove, eliminating the formation of corners in the stair structure and permitting thorough cleaning of the same. The lower edge of the riser 23 fits against and is riveted to the lower edge of the plate 22 adjacent the angle edge 25 thereof which is in turn screwed to the upper edge of the plate 22 of the step next there below.

In Fig. 3 of the drawing a further modified form of the stair structure is shown in which the concrete tread 30 is supported by the arcuate plate 3]. similar in construction to the plates 8 and 22, the riser 32. however. differs from the risers in the previously described forms of the invention in that their upper edges are bent outwardly and upwardly as shown at 33 and have a head 34 formed thereon over which the rolled edge 35 of a non-slip tread 36 engages. A non-slip tread 36 has its upper surface roughened as shown at 37 and it is braced by a. substantially Z brace 38 which is attached to the tread and to the angled portion 33 of the riser 32.

It is, of course, to be understood that the invention may be constructed in various other manners and the parts associated in different relations and, therefore, I do not desire to be limited in any manner except as set forth in the claims hereunto ap pended. I

Having thus described my invention what I claim is:

1. A stair st rncture comprising in combination with a concrete filler. sheet metal plates extending the width of the stairs and being curved transversely and present ing concave surfaces outwardly, said plates each having its lower edge bent to lie in a horizontal plane and overlapping the upper edge of the plate next there below, and vertical reinforcing members of sheet metal having their lower edges resting upon the horizontally bent edges.

2. A stair structure comprising in com bination a epricrete filler; sheet-*metal: plates emndifig the Width of the stairs and being curved transversely and presenting concave surfaces outwardly, said plates each having its lower edge bent to lie in a horizontal plane and overlapping the, upper edge of the plate next there below, and vertical reinforcing members ofsheet metal having gthfir ggvfmedges'gregting upon the horizontal y n dgesfsaid vertical rcinl0 forcing members having their upper edges bent trangve ssqly tg iygage over the upper edge of the concrete ller.

1in testimeny whereof I allix my signature.

WILLIAM J. KURBER. 

